Description
4329 Safety Instrumented System (SIS)
4329 Safety Instrumented System (SIS)
Module Clips Drive controller servo motor
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Application Scheme of Industrial Ethernet Remote IO Module in Intelligent Manufacturing Workshop
With the advent of Industry 4.0, intelligent manufacturing has become a trend in industrial production. Intelligent manufacturing requires efficient, stable, and reliable industrial Ethernet remote IO modules to monitor the production process. This article will share an application case of an intelligent manufacturing workshop based on industrial Ethernet remote IO module.4329 Safety Instrumented System (SIS)
The production process of this intelligent manufacturing workshop is mainly divided into two parts: injection molding and automated assembly. The injection molding process requires controlling parameters such as the melting temperature of the melt, the speed and pressure of the injection molding machine. The automated assembly process requires controlling the actions of the assembly robot and detecting the quality of the product. In addition to these production process data, there are also equipment production data such as daily and weekly production in the workshop, as well as equipment status data such as operation, manual, automatic, mold adjustment, and alarm.
In the past, the production process of the factory mainly relied on traditional hard wiring to control the production process, resulting in low work efficiency due to the need for frequent replacement of transmission lines to meet production needs. Moreover, it is very difficult to collect a large number of types of detection and monitoring data for intelligent manufacturing. In order to improve efficiency, production quality, and reliability, the factory has introduced the industrial Ethernet remote IO module MxxT using barium rhenium technology.
The injection molding machine itself comes with MODBUS industrial control bus data or basic status signal output. The barium rhenium technology remote IO module collects data from the device interface RS232/RS485 port, collects status information of the injection molding machine such as startup, operation, and pause, and uploads it to the injection molding machine controller, or wirelessly uploads it to the cloud server. Based on devices, according to the communication protocols and interfaces of different devices, data is obtained by calling their interface channels, and then transmitted to the server.
The remote IO module is connected to the controller of the injection molding machine, and the operation data of the injection molding machine is uploaded and distributed wirelessly, achieving remote monitoring and intelligent control of the injection molding machine. In addition, the remote I/O module supports perceptual access to peripheral devices such as mold temperature machines, cutting machines, and dryers for injection molding machines, providing users with smart factory services.
During the injection molding process, the industrial Ethernet remote IO module transmits real-4329 Safety Instrumented System (SIS)time data such as temperature, pressure, and speed to the main controller for monitoring and adjustment, ensuring the stability and compliance of production parameters under different conditions. In the automated assembly process, the industrial Ethernet remote IO module collects data through sensors and other devices, and transmits the relevant data to the main controller for adjustment of relevant actions. For example, the industrial Ethernet remote IO module can monitor the actions of assembly robots, detect the accuracy of product assembly and product quality, and ensure the production quality and stability of the product. At the same time, all production data can also be collected and analyzed remotely, helping enterprise managers better monitor production efficiency and quality.
By introducing industrial Ethernet remote IO modules, this intelligent manufacturing workshop not only improves production efficiency and stability, but also reduces labor and energy costs. Because the industrial Ethernet remote IO module can help enterprises complete the collection and monitoring of production data with one click, as well as avoid unnecessary line replacement and the need for workers to enter and exit the production process, thereby reducing costs and improving production efficiency for enterprises.
In summary, the application of industrial Ethernet remote IO modules in intelligent manufacturing workshops not only improves production efficiency and quality, reduces costs, but also achieves intelligent and digital management of production processes, bringing more opportunities and development space for enterprise development.
In addition, this device is widely used for networking and data collection of industrial equipment such as injection molding machines, air compressors, CNC machine tools, on-site PLCs, instruments, sensors, CNC, and electromechanical equipment.
Building a High Channel Density Digital IO Module for the Next Generation Industrial Automation Controller
There are currently many articles introducing Industry 4.0, and smart sensors are becoming increasingly popular in factory environments (I and other authors have written about these topics). Although we have all noticed a significant increase in the use of sensors in factories, processing plants, and even some newly built automation systems, the widespread use of sensors has also brought about an important change, which is the need to handle a large amount of IO within these old controllers. These IOs may be digital or analog. This requires the construction of high-density IO modules with size and heat limitations. In this article, I will focus on digital IO, and in subsequent articles, I will introduce analog IO.
Usually, digital IO in PLC consists of discrete devices such as resistors/capacitors or independent FET drives. In order to minimize the size of the controller as much as possible and to handle 2 to 4 times the number of channels, this has led to a shift from a separate approach to an integrated approach.
We can use the entire article to illustrate the drawbacks of the split method, especially when the number of channels processed by each module reaches 8 or more. However, when it comes to high heat/power consumption, a large number of split components (from the perspective of size and mean time between failures (MTBF)), and the need for reliable system specifications, it is sufficient to demonstrate that the split method is not feasible.
Figure 1 shows the technical challenges faced in building high-density digital input (DI) and digital output (DO) modules. In both Di and DO systems, size and heat dissipation issues need to be considered.
Digital input
size
heat
Supports all input types
Type 1, 2, 3, Input
Supports 24 V and 48 V inputs
Robust operating specifications
Wire breakage detection
Digital output
Support for different types of output driver configurations
size
Integrated demagnetization of inductive loads
Heat – When driving multiple outputs
Drive accuracy
diagnosis
For digital input, it is also important to note that it supports different input types, including 1/2/3 type inputs, and in some cases, 24V and 48V inputs. In all cases, reliable operating characteristics are crucial, and sometimes circuit detection is also crucial.
For digital outputs, the system uses different FET configurations to drive the load. The accuracy of the driving current is usually an important consideration. In many cases, diagnosis is also very important.
We will explore how integrated solutions can help address some of these challenges.
Design a High Channel Density Digital Input Module
The traditional split design uses a resistive voltage divider network to convert 24V/48V signals into signals that can be used by microcontrollers. The front-end can also use discrete RC filters. If isolation is required, external optocouplers are sometimes used.
Figure 1 shows a typical discrete method for constructing digital input circuits.
Figure 1. Considerations for digital input and output modules.
This type of design is suitable for a certain number of digital inputs; 4 to 8 per board. Beyond this number, this design will soon become impractical. This separation scheme can bring various problems, including:
High power consumption and related board high temperature points.
Each channel requires an optocoupler.
Excessive components can lead to low FIT rate and even require larger devices.
More importantly, the split design method means that the input current increases linearly with the input voltage. Assuming a 2.2K Ω input resistor and 24V V is used. When the input is 1, for example, at 24V, the input current is 11mA, which is equivalent to a power consumption of 264mW. The power consumption of the 8-channel module is greater than 2W, and the power consumption of the 32-bit module is greater than 8W. Refer to Figure 3 below
From a cooling perspective alone, this split design cannot support multiple channels on a single board.
One of the biggest advantages of integrated digital input design is the significant reduction in power consumption, thereby reducing heat dissipation. Most integrated digital input devices allow configurable input current limitations to significantly reduce power consumption.
When the current limiting value is set to 2.6mA, the power consumption is significantly reduced, with each channel approximately 60mW. The rated value of the 8-channel digital input module can now be set below 0.5
Another reason for opposing the use of split logic design is that sometimes DI modules must support different types of inputs. The standard 24V digital input specifications published by IEC are divided into Type 1, Type 2, and Type 3. Type 1 and Type 3 are usually used in combination because their current and threshold limits are very similar. Type 2 has a current limit of 6mA, which is higher. When using the split method, it may be necessary to redesign as most discrete values need to be updated.
However, integrated digital input products typically support all three types. Essentially, Type 1 and Type 3 are generally supported by integrated digital input devices. However, in order to meet the minimum current requirement of 6mA for Type 2 input, we need to use two channels in parallel for one field input. And only adjust the current limiting resistance. This requires a circuit board change, but the change is minimal.
Modify the watchdog time of the PROFINET IO device under 16 STEP7
3.2 Check if the installation of PROFINET IO communication equipment meets the specifications
Most cases of PROFINET IO communication interference problems are caused by equipment installation that does not comply with the installation specifications for PROFINET IO communication, such as incomplete shielding, unreliable grounding, and being too close to interference sources. Installation that meets the specifications can avoid communication failures caused by electromagnetic interference. You can refer to the following brief installation requirements for PROFINET:
1. Wiring of PROFINET 4329 Safety Instrumented System (SIS)
In order to reduce the coupling of electric and magnetic fields, the larger the parallel distance between PROFINET and other power cable interference sources, the better. In accordance with IEC 61918, the minimum distance between PROFINET shielded cables and other cables can be referred to Table 1. PROFINET 4329 Safety Instrumented System (SIS) can be wired together with other data cables, network cables, and shielded analog cables. If it is an unshielded power cable, the minimum distance is 200mm.
Comprehensive analysis of the principle and application skills of microcontroller IO port
IO port operation is the most basic and important knowledge in microcontroller practice. This article takes a long time to introduce the principles of IO ports. I also consulted a lot of materials to ensure the accuracy of the content, and spent a long time writing it. The principle of IO ports originally required a lot of in-depth knowledge, but here it has been simplified as much as possible for easy understanding. This will be of great help in solving various IO port related problems in the future.
The IO port equivalent model is my original method, which can effectively reduce the difficulty of understanding the internal structure of the IO port. And after consulting and confirming, this model is basically consistent with the actual working principle.
I mentioned a lot earlier, and many people may already be eager to actually operate microcontrollers. The IO port, as the main means of communication between the microcontroller and the outside world, is the most basic and important knowledge for microcontroller learning. Previously, we programmed and implemented an experiment to light up the LED at the IO port. This article will continue to introduce the relevant knowledge of the IO port.
In order to better learn the operation of IO ports, it is necessary to understand the internal structure and related concepts of IO ports. These knowledge are very helpful for subsequent learning, with a focus on understanding and no need to memorize them intentionally. If you don”t remember, just come back and take a look. If you use it too much, you will naturally remember.
We have said that the most accurate and effective way to understand a chip is to refer to official chip manuals and other materials. But for beginners of microcontrollers, it may be difficult to understand the chip manual directly, especially when they see a bunch of English, unfamiliar circuits, and terminology. If it were me, I would definitely be crazy. But here I still provide a picture taken from Atmel”s official “Atmel 8051 Microcontrollers Hardware Manual”.
The purpose of giving this picture is not to dampen everyone”s enthusiasm for learning, but to help everyone understand how the various microcontroller materials we have seen come from and whether they are accurate. All of these can be clarified through official information, which will be helpful for everyone to further learn something in the future.
Introduction to the Second Function
The above figure is the authoritative 51 microcontroller IO port structure diagram provided by the official. It can be seen that the internal structure of the four sets of IO ports of the microcontroller is different, because some IO ports have a secondary function, as mentioned in the introductory section.
Do you remember this pin diagram? The second function name of the IO port is marked in parentheses. Except for P1, each interface has a second function. When introducing the microcontroller system module, I mentioned that the 51 microcontroller has an interface for reserved extended memory, which is the second function of P0 and P1 in the figure (while also using pins such as 29 and 30). Because it is not widely used and involves in-depth knowledge, no specific research will be conducted. By the way, the AD0~AD7 we see here are actually used for parallel ports. The second function of the P3 port, including serial port, will be introduced in detail later.
The drawbacks of network IO and the advantages of multiplexing IO
In order to talk about multiplexing, of course, we still need to follow the trend and adopt a whiplash approach. First, we will talk about the drawbacks of traditional network IO and use the pull and step method to grasp the advantages of multiplexing IO.
For the convenience of understanding, all the following code is pseudo code, and it is sufficient to know the meaning it expresses.
Blocking IO
The server wrote the following code to handle the data of client connections and requests.
Listenfd=socket()// Open a network communication port
Bind (listenfd)// binding
Listen (listenfd)// Listening while (1){
Connfd=accept (listenfd)// Blocking connection establishment
Int n=read (connfd, buf)// Blocking read data
DoSomeThing (buf)// What to do with the data you read
Close (connfd)// Close the connection and wait for the next connection in a loop
}
This code will be executed with stumbling blocks, just like this.
It can be seen that the thread on the server is blocked in two places, one is the accept function and the other is the read function.
If we expand on the details of the read function again, we will find that it is blocked in two stages.
This is traditional blocking IO.
The overall process is shown in the following figure.
So, if the client of this connection continues to not send data, the server thread will continue to block on the read function and not return, nor will it be able to accept other client connections.
This is definitely not feasible.
Non blocking IO
To solve the above problem, the key is to modify the read function.
A clever approach is to create a new process or thread every time, call the read function, and perform business processing.
While (1){
Connfd=accept (listenfd)// Blocking connection establishment
Pthread_ Create (doWork)// Create a new thread
}
Void doWork(){
Int n=read (connfd, buf)// Blocking read data
DoSomeThing (buf)// What to do with the data you read
Close (connfd)// Close the connection and wait for the next connection in a loop
}
In this way, once a connection is established for a client, it can immediately wait for a new client connection without blocking the read request from the original client.
However, this is not called non blocking IO, it just uses multithreading to prevent the main thread from getting stuck in the read function and not going down. The read function provided by the operating system is still blocked.
So true non blocking IO cannot be achieved through our user layer tricks, but rather by imploring the operating system to provide us with a non blocking read function.
The effect of this read function is to immediately return an error value (-1) when no data arrives (reaches the network card and is copied to the kernel buffer), rather than waiting for blocking.
The operating system provides this feature by simply setting the file descriptor to non blocking before calling read.
Fcntl (connfd, F_SETFL, O_NONBLOCK);
Int n=read (connfd, buffer)= SUCCESS;
In this way, the user thread needs to loop through the call to read until the return value is not -1, and then start processing the business.
We noticed a detail here.
Non blocking read refers to the stage where data is non blocking before it reaches the network card, or before it reaches the network card but has not been copied to the kernel buffer.
When the data has reached the kernel buffer, calling the read function is still blocked and requires waiting for the data to be copied from the kernel buffer to the user buffer before returning.
The overall process is shown in the following figure
IO multiplexing
Creating a thread for each client can easily deplete the thread resources on the server side.
Of course, there is also a clever solution. After accepting each client connection, we can put the file descriptor (connfd) into an array.
Fdlist. add (connfd);
Then create a new thread to continuously traverse the array and call the non blocking read method for each element.
While (1){
For (fd “- fdlist){
If (read (fd)!=- 1){
DoSomeThing();
}
}
}
In this way, we successfully processed multiple client connections with one thread.
Do you think this means some multiplexing?
But this is just like using multithreading to transform blocked IO into seemingly non blocking IO. This traversal method is just a small trick that our users have come up with, and every time we encounter a read that returns -1, it is still a system call that wastes resources.
Making system calls in a while loop is not cost-effective, just like making rpc requests while working on distributed projects.
So, we still need to plead with the operating system boss to provide us with a function that has such an effect. We will pass a batch of file descriptors to the kernel through a system call, and the kernel layer will traverse them to truly solve this problem.
MQTT IoT Remote IO Module Based on Ethernet Communication Technology
MQTT IoT Remote IO Module Based on Ethernet Communication Technology
Barium rhenium technology remote IO modules are widely used in IoT scenarios such as intelligent transportation, smart water conservancy, smart agriculture, smart campuses, smart communities, smart power distribution, and smart water conservancy.
With the development of IIOT industrial Internet of Things technology, more and more traditional assets need to be connected to the internet, achieving unified data collection and analysis, and breaking the phenomenon of traditional device information silos. The barium rhenium technology remote IO module M160T, which supports IoT protocols, has become an excellent choice for many enterprises to achieve device networking, remote control, and data collection based on the compatibility of existing devices and the accessibility of IoT platforms!
Ethernet communication technology is a mature communication technology because it has the characteristics of stability, reliability, mature technology, fast transmission speed, and fast construction wiring. Due to its wide application, Ethernet communication through the MQTT protocol is the main way for enterprise equipment to go to the cloud. Barium rhenium technology can quickly collect data and control such as air compressor room, property living pump room, street light control, liquid level collection, temperature and humidity collection through Ethernet remote IO module.4329 Safety Instrumented System (SIS)
So, why is the remote IO module of barium rhenium technology widely used in the field of industrial IoT? The specific reasons are as follows.
1. Actively connect to cloud platforms:
Based on the characteristics of Ethernet communication networks, the barium rhenium technology remote IO module does not require complex settings such as peanut shells to achieve the Internet of Things. The barium rhenium technology remote IO module needs to support both TCP client and TCP server functions.
2. Compatibility with existing systems:
It supports TCP Server and Modbus TCP protocol functions, and is compatible with device access of traditional upper level systems or HMI TCP clients.
3. Support multiple IoT platforms:
Supports standard MQTT, Modbus TCP, and Modbus RTU over TCP protocols. It can be connected to public cloud IoT platforms and user built MQTT private clouds through the MQTT protocol. It can also be connected to SCADA and DCS systems through Modbus TCP.
4. Rich IO interfaces and scalability:
There are many types of IO for industrial field data collection and replication. The Ethernet IO module of barium rhenium technology supports signal acquisition from various devices such as 4-20Ma, 0-20mA, 0-5V, 0-10V, RS485, DI, DO, PT100, PT1000, pulse input, pulse output, etc. At the same time, it expands the instrument data reading ability of RS485 devices.
5. Convenient installation method:
The volume of industrial on-site control boxes is often very limited, and the barium rhenium technology Ethernet IO module adopts a direct plug-in connection terminal and rail installation method. The compact volume greatly saves space in the control box!
6. Industrial grade design
The industrial environment is harsh, and the remote IO module using barium rhenium technology needs to adopt an industrial grade design, which can work continuously and stably in harsh environments.
Through the use of barium rhenium technology remote IO modules, there is no need to replace existing various enterprise assets, and the digital transition to the Internet of Things platform can be quickly achieved. Therefore, barium rhenium technology remote IO modules are widely used in industrial IoT, such as intelligent real estate, intelligent campus, intelligent factory, intelligent transportation, intelligent water conservancy, intelligent agriculture, intelligent campus, intelligent community, intelligent transportation, and many other industries.
What is the role of distributed IO modules and what are their main applications in
The distributed IO module transmits status signals from the measurement and control field to various measurement and control fields for control. It is mainly used in the industrial field and can also be used for detection of equipment such as air conditioners and motors.
In distributed systems, there are important business data closely related to system operation, as well as data related to nodes, application services, and data services, which are crucial for the normal operation of clusters.
IO on general PLCs is usually closely followed by CPU units, but in order to facilitate connection and maintenance, the concept of distributed IO has been proposed in the industrial field. That is to say, the IO unit can be arranged far away from the PLC CPU unit and communicate through the network communication protocol of the device layer.
The distributed IO module is developed for detecting and implementing remote control of various types of standard analog and switch signals (frequency, pulse, or switch state signals) in the field of measurement and control. The series of modules can digitize the test signal front-end and transmit it to the host through optical fiber; Or transmit the control instructions sent by the host to the controlled device to achieve remote control. Especially suitable for state detection and control of complex electromagnetic environments in power, industrial control, on-site switchgear, and large power equipment.
The role of distributed IO modules:
1. Support 4-way switch digital quantity
2. Supports 8 analog inputs
3. 4 relay outputs, 1 RS485 serial port data acquisition to Ethernet
4. 485 to Ethernet serial server
5. Supports Modbus to TCP/UDP protocol conversion
6. Supports virtual serial ports and interfaces with various configuration software
7. Support 0-5V, 0-10V, 0-30V range acquisition
8. Supports 0-20ma and 4-20ma range acquisition
What is the function of an IO chip
Io generally refers to input and output devices, where I is the input and O is the output. The input to the IO port of the chip is the external signal transmission to the chip, while the output is the internal signal transmission to other devices. The input and output are relative. In short, in a broad sense, the control of input and output interfaces is called an IO chip, and network cards are also considered IO or array cards.
The CPU must read and write data to external registers or ROMs on RAM or other hardware through IO commands (such as input/output commands). For example, reading a keyboard involves accessing external registers on the keyboard through the 60H port, and the chip on the keyboard scans the keyboard. Pressing or holding down a key for a long time will cause the chip to generate corresponding scan or break codes, which will be written to the external register of the 60H port, so that the CPU can achieve the purpose of controlling the keyboard. Therefore, I think IO chips should refer to a large category. The CPU already has powerful IO instructions and corresponding control buses.
51 microcontroller IO port input and output mode_ Four usage methods for IO ports
The traditional 51 microcontroller IO interface can only be used as a standard bidirectional IO interface. If it is used to drive LED, it can only be driven by injecting current or using a transistor external expansion drive circuit.
Current injection method: LED positive pole connected to VCC, negative pole connected to IO port. If the IO is at a high level, the two poles of the LED are at the same level, and there is no current, the LED will turn off; IO is at low power level, current flows from VCC to IO, and LED lights up. But when you connect the positive pole of the LED to the IO interface and the negative pole to GND, placing the IO interface at a high level will cause the LED to light up. However, due to the insufficient pull-up capability of the IO interface, the brightness is not ideal. The following method can be used to solve this problem.
Push-pull working mode: The positive and negative poles of the LED are connected to two IO ports, and then the positive IO interface is set as the push-pull output, while the negative IO interface is set as the standard bidirectional current input. The push pull method has strong pull-up ability and can achieve high-level LED driving.
Four usage methods for IO ports4329 Safety Instrumented System (SIS)
From the perspective of the characteristics of the I/O port, the P0 port of Standard 51 is an open drain structure when used as an I/O port, and in practical applications, a pull-up resistor is usually added; P1, P2, and P3 are all quasi bidirectional I/Os with internal pull-up resistors, which can be used as both input and output. The I/O port characteristics of the LPC900 series microcontroller have certain differences, and they can be configured into four different working modes: quasi bidirectional I/O, push pull output, high resistance input, and open drain.
Compared with Standard 51, the quasi bidirectional I/O mode differs in internal structure but is similar in usage. For example, when used as an input, it must first write “1” to set it to high level before reading the level state of the pin.!!!!! Why is it like this? Please refer to the diagram below for analysis.
The characteristic of push-4329 Safety Instrumented System (SIS)pull output is that it can drive a large current regardless of whether it outputs high or low levels. For example, when outputting high levels, it can directly light up the LED (by connecting several hundred ohm current limiting resistors in series), which is difficult to achieve in quasi bidirectional I/O mode.
The characteristic of high impedance input mode is that it can only be used as an input, but it can obtain relatively high input impedance, which is necessary in analog comparator and ADC applications.
The open drain mode is similar to the quasi bidirectional mode, but there is no internal pull-up resistance. The advantage of open drain mode is good electrical compatibility. If the external pull-up resistor is connected to a 3V power supply, it can interface with a 3V logic device. If the pull-up resistor is connected to a 5V power supply, it can also interface with a 5V logic device. In addition, the open drain mode can also conveniently implement the “line and” logic function.
For the explanation of the above question, there is this information:
High resistance state is a common term in digital circuits, referring to an output state of a circuit that is neither high nor low. If the high resistance state is input into the next level circuit, it has no impact on the lower level circuit, just like not connected. If measured with a multimeter, it may be high or low, depending on what is connected afterwards.
High resistance states can be understood as open circuits during circuit analysis. You can think of it as having a very high output (input) resistance. His limit can be considered suspended.
Typical applications of high resistance states:
1. On the bus connected structure. There are multiple devices hanging on the bus, and the devices are connected to the bus in a high impedance form. This automatically releases the bus when the device does not occupy it, making it easier for other devices to gain access to the bus.
2. Most microcontroller I/O can be set to high impedance input when used, such as Lingyang, AVR, and so on. High resistance input can be considered as having infinite input resistance, indicating that I/O has minimal impact on the preceding stage and does not generate current (without attenuation), and to some extent, it also increases the chip”s resistance to voltage surges.
1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
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3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
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